diff --git a/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentCreateRequest.java b/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentCreateRequest.java
index b0b8204..5b201bf 100644
--- a/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentCreateRequest.java
+++ b/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentCreateRequest.java
@@ -40,7 +40,7 @@ public record DocumentCreateRequest(
         String documentType,
         @NotBlank @Size(max = 32)
         String dataType,
-        @NotBlank @Size(max = 255)
+        @Size(max = 255)
         String documentDataId,
         @Size(max = 255)
         String externalId,
diff --git a/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentUpdateRequest.java b/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentUpdateRequest.java
index c37ea20..439ed75 100644
--- a/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentUpdateRequest.java
+++ b/user-data-store-client-model/src/main/java/com/wultra/security/userdatastore/client/model/request/DocumentUpdateRequest.java
@@ -40,7 +40,7 @@ public record DocumentUpdateRequest(
         String documentType,
         @NotBlank @Size(max = 32)
         String dataType,
-        @NotBlank @Size(max = 255)
+        @Size(max = 255)
         String documentDataId,
         @Size(max = 255)
         String externalId,